Pottery-machine



UNITED STATES PATENT EEroE.

JOHN F. BURSON AND GEORGE O. BURSON, OF ROGERS, OHIO.

MACHINE.

SPECIFIGATION forming part of Letters Patent No. 578,207, dated March 2, 1897.

Application filed June 22, 1896.

T all whom, it nuty concern.-

Be it known that we, JOHN F. BURSON and GEORGE O. BURSON, citizens of the United States, and residents of Rogers, in the county of Oolumbiana and State of Ohio, have invented certain new and useful Improvements in Pottery-Machines; and we do hereby declare that the following is a full, clear, and exact description of the invention,which will enable others skilled in the art to which it appertains to makeand use the same, reference being bad to the accompanying drawings, which form a part of this specification.

Our invention relates to machines for molding and modeling oval, elliptical, scalloped, or other irregular forms of pottery; and its object is to provide an improved construction of the same which shall possess superior advantages with respect to efficiency in use.

The invention consists in the novel construction and combination of parts hereinafter fully described and claimed.

' Inthe accompanying drawings, Figure 1 is a longitudinal sectional view of a potterymachine constructed in accordance with our invention. Fig. 2 is a horizontal section of the same on the line a: 00, Fig. 1. Fig. 3 is a view looking from the under side of the cover for holding the mold in the j Ollie-head. Fig. 4 is a transverse sectional view of the adjustable tool-holder and tool. V

In the said drawings thereference-numeral 1 designates four corner-uprights connected together by side beams 2 and end beams 3, and also by intermediate side beams 4, forming a frame or table provided with a top 5.

The numeral 7 designates a vertical shaft having at its upper end a conical or cupshaped jollie-head 8, in which the mold to receive the clay to be worked or molded is inserted. Near the lower end the shaft is provided with a driving-pulley 9, with which is to be connected a belt (not shown) for rotating the shaft.

The numeral 10 designates a cog-wheel secured to said shaft, which meshes with a pinion 12, journaled to cross-bars 13, connected with the frame or table. This pinion is formed with a number of holes 14 at varying distances from the center to receive a removable and replaceable crank-pin 15, to which is connected a horizontal crank 16. The rear Serial No. 596,481. (No model.)

which is pivoted a forwardly-extending arm 24, the front end of which is pivot-ed to lugs 25 on a movable sleeve 26. This sleeve slides or reciprocates on a pull-down27, the rear end of which is pivoted to a bracket 28, se cured to the frame or table-top.

Thev numeral 29 designates an adjustable tool-holder consisting of a rectangular box or v casing provided with a horizontal partition 30, between which and the top of thebox the pull-down passes. This tool-holder can be moved back and forth on the sleeve, so as to adjust it thereon, and is provided with a setscrew 31 to hold it in its adjusted position. In the bottom of the tool-holder is alongitudinal slot 32, with which engages a molding-tool 34, provided with a rectangular head 35, which fits in the space between said partition and the bottom of the holder and holds the tool in place. A set-screw 36, passing through the holder, serves to hold the tool in any position to which it may be adjusted, and by loosening the same the tool may be moved longitudinally back and forth.

The upper edge of the j Ollie-head is formed with two diametric recesses 37, with which engage lugs 38 on a circular cover 39, fitting on the head to hold the mold in place thereon. This cover is formed with a central oval or elliptical beveled opening corresponding withthe shape of the article to be molded.

The cross-bars 13, to which the pinion is journaled, are formed with semicircular registering recesses at their meeting edges, forming a circular opening to receive the journal of the pinion. The ends of these bars rest upon the short beams 40, secured to the uprights of the frame, and are held in place thereon by means of clamping-bars 41, through which and the beams 40 pass screwbolts 42, provided with nuts 43. By loosening these nuts the bars 13 may be adjusted longitudinally to bring them nearer to or farther from the cog-wheel on the main shaft, so as to allow different-sized pinions to be used with the machine.

The operation is as follows: The clay to be worked is placed in a suitable mold, as usual, which in turn is placed in the cover which has been put on the jollie-head, the lugs thereof engaging with the recesses in the j Ollie-head to prevent the cover and mold from turning on the head or rotating independently thereof. The pull-down is then depressed, carrying the tool down into the mold in the jollie-head. The shaft and jollie-head are now rotated by the pulley on the shaft, driven by any suitable motive power, causing the mold in the jollie-head to be correspondingly rotated.

It should be stated that only one edge of the tool operates on the clay in the mold, and as the pinion 12 is rotated by the cog-wheel the crank connected with the slide-bars Will move the latter alternately back and forth, carrying with them the upright 23 and the arm pivoted to the upper end thereof, cansin g the sleeve and tool-holder connected therewith to be correspondingly reciprocated and the tool caused to alternately approach to and recede from the center of the jollie-head and thus follow the contour of the rotating mold. During this operation as the pinion rotates and the crank-pin approaches the dead-center farthest from the cog-wheel the tool will be moved outward to its extreme limit and will follow the longest cent er of the mold and will begin to recede or move toward the center of the j Ollie-head as the said pin passes said deadpoint, and will again begin to advance as it passes the opposite dead-point, and again approaches the point farthest from the cogwheel. If the cog-wheel and pinion rotated at the same speed, this operation could not produce a perfect article, as during one-half of the rotation of the mold the tool would be out of contact'with the clay, so therefore the cog-wheel and pinion are so proportion ed that the pinion will move two or more revolutions to one of the cog-wheel, so that as the jolliehead and mold make one rotation the tool will make two or more strokes. By this means the tool always follows the contour of the mold, being at some distance therefrom at all points during its rotation.

By removing the crank-pin from the hole in the pinion and placing it in another of the holes at a different distance from the axis the throw or play of the tool will be varied to form ovals or scallops more or less elongated or struck from different centers.

By removing the pinion and substituting therefor one of a different size irregularshaped oval or scalloped ware may be produced.

Having thus fully described our invention, what we claim is- 1. In a pottery-machine, the combination with the rotatable shaft, the jollie-head, the

cog-wheel, the differential pinion meshing therewith and the crank-pin, of the crank, the slide-bars connected therewith, the upright, the arm pivoted thereto, the pivoted pull-down, the movable sleeve 011 said pull down pivotally connected with said arm, the tool-holder adjustably secured thereto, formed with a slot in its bottom and provided with a horizontal portion, and the adj ust-able tool having a rectangular head; substantially as described.

2. In a pottery-machine, the combination with the rotatable shaft, the j0llie-head, the cog-wheel, the differential pinion meshing therewith formed with a number of holes at varying distances from the center and the removable and replaceable crank-pin adapted to engage therewith, of the crank, the slidebars connected therewith, the upright, the arm pivoted thereto,'the pivoted pull-down, the movable sleeve on said pull-down pivotall y connected with said arm, the tool-holder adjustably secured thereto, formed with a slot in its bottom and provided with a horizontal portion and the adjustable tool having a rectangular head, substantially as described.

3. In a pottery-machine, the combination with the frame, the rotatable shaft, the jolliehead, the cog-wheel secured to said shaft, the pinion meshing therewith, the adjustable cross-bars having semicircular recesses to receive the journal of said pinion, the beams on which the ends of said bars rest, the clamping-bars, the screw-bolts and the nuts, of the crank-pin on said pinion, the crank, the slidebars, the upright, the arm pivoted thereto, the pivoted pull-down, the movable sleeve thereon, pivoted to said arm, the adjustable tool-holder and the removable tool connected therewith, substantially as described.

4. In a pottery-machine, the combination with the rotatable shaft, the circular jolliehead, the removable cover having an oval opening therein and provided with lugs fitting in recesses in the head, the cog-wheel located on said shaft, the differential pinion meshing therewith, and the crank-pin on said pinion, of the crank, the slide-bars connected therewith, the upright, the arm pivoted thereto, the pivoted pul1down, the movable sleeve on said pull-down pivotally connected with said arm, the tool-holder adjustably secured thereto and the adjustable tool, substantially as described.

In testimony that we claim the foregoing as our own we have hereunto affixed our signatures in presence of two Witnesses.

JOHN F. BURSON. GEORGE O. BURSON. \Vitnesses:

M. C. HOLLINGER, G. M. SHAFER. 

